No, but I do have common sense. Given the timing that Shailene was cast, it makes no sense that she would not appear in the film until the very end. You think it's a good idea for them to basically shoehorn her in at the end of a film? It's not, and if they were planning on doing that they would not have announced her casting in the first place.

That wouldn't exactly be SHOEHORNED. I can understand the mystique of her cast choice being hushed up if it WERE to play out like that. But your logic of her having a bigger role in the film just because she was cast first clearly has no affect of how she could fit in the story. I just thought it would be cool if that's how it happened. Your argument lacks predicate.